7218842 has 8 divisors (see below), whose sum is σ = 10958976. Its totient is φ = 3565852.

The previous prime is 7218839. The next prime is 7218853. The reversal of 7218842 is 2488127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×7218842² = 104223359641928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7218799 and 7218808.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21578 + ... + 21909.

It is an arithmetic number, because the mean of its divisors is an integer number (1369872).

Almost surely, 2^7218842 is an apocalyptic number.

7218842 is a deficient number, since it is larger than the sum of its proper divisors (3740134).

7218842 is a wasteful number, since it uses less digits than its factorization.

7218842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43572.

The product of its digits is 7168, while the sum is 32.

The square root of 7218842 is about 2686.7902783805. The cubic root of 7218842 is about 193.2661723386.

The spelling of 7218842 in words is "seven million, two hundred eighteen thousand, eight hundred forty-two".